AOPA Pilot Magazine - April 2021 - 90

P&E 

PROFICIENCY

Altimeter setting: 30.42 in Hg
Temperature: 14 degrees Celsius
Cruise altitude: 6,000 feet
Pressure altitude: 6,000+1,000
(29.92-30.42)=5,500 feet
Propeller setting: 2,500 rpm
Manifold pressure setting:
24.25+0.5=24.75 in Hg (for temp
10 degrees above standard)
Weight: 3,300 pounds
IN THIS SCENARIO, we should expect to burn
approximately 18.5 gallons per hour and
cruise with 164 knots true airspeed. Beyond
these calculations, these charts demonstrate performance principles. For example,
at a given pressure altitude, greater temperature results in a higher true airspeed.

Altimeter setting: 30.42 IN Hg
Temperature: 14 degrees C
For those that don't seem reasonable, I
Cruise altitude: 6000 FT
call BS and press for more details.
Pressure altitude: 6000+1000(29.92-30.42)=5500 FT
Penny's airplane was an older Cessna
Propeller Setting: 2500 RPM
172 that had been upgraded with a
above standard)
Manifold Pressure Setting: 24.25+0.5=24.75 IN Hg (for temp 10 degrees
195-horsepower
Lycoming engine. She
Weight: 3300 pounds
used the aircraft profile for the original
version with a less powerful, and there-

per hour and cruise with
In this scenario, we should expect to burn approximately 18.5 gallons
fore less thirsty, engine. Interestingly,
performance
demonstrate
charts
these
calculations,
these
Beyond
airspeed.
true
knots
165
from the standard profiles provided in
results in a higher
principles. For example, at a given pressure altitude, greater temperature
the EFB app, there was probably no way
true air speed.
for her to choose a single one that made

90 | AOPA PILOT April 2021

and I can't possibly know the performance information on all those platforms.
Candidates will compute many estimates for the flight including takeoff
distances, cruise speeds, time estimates,
and required fuel. If they all seem reasonable based on my experience with similar
models, I randomly select a few that they
verify using the pilot's operating handbook to ensure that the candidate has a
facility with the charts and calculations.

CATHERINE CAVAGNARO

box, and she blindly trusted the values
from her EFB. In her case, the procedure
was correct but the data the algorithm
employed
werestandard)
not-so it was a case of
mp 10 degrees
above
garbage in, garbage out. A notice of disapproval isn't fun for the candidate or the
examiner, but I console myself with the
8.5 gallons
per hour and cruise with
idea that it beats reading about another
charts demonstrate performance
fuel-exhaustion accident in the news.
er temperature results in a higher
As a designated examiner, I give practical exams in many different aircraft

sense for all performance calculations. For
any airplane that has been modified, such
as with a different engine or the addition
of a STOL kit, it's possible that none of
the aircraft profiles loaded in the EFB is
appropriate. In this case, a custom profile should be set up in the EFB that is
reasonably accurate, and corroborating
the results with information from actual
flights is imperative.
Remember too that an aircraft performance profile is merely a snapshot in time.
Not only do we add and remove equipment that may affect the performance,
but wear and tear take a toll as well.
Several years ago, I had the engine overhauled in my Cessna and found the change
in performance shocking; it's unreasonable to expect the same performance
over the life of an engine. In " Hopefully
Optimistic: Complex Calculations Using
Your Airplane's POH " (July 2019 AOPA



AOPA Pilot Magazine - April 2021

Table of Contents for the Digital Edition of AOPA Pilot Magazine - April 2021

Contents
AOPA Pilot Magazine - April 2021 - Intro
AOPA Pilot Magazine - April 2021 - Cover1
AOPA Pilot Magazine - April 2021 - Cover2
AOPA Pilot Magazine - April 2021 - Contents
AOPA Pilot Magazine - April 2021 - 2
AOPA Pilot Magazine - April 2021 - 3
AOPA Pilot Magazine - April 2021 - 4
AOPA Pilot Magazine - April 2021 - 5
AOPA Pilot Magazine - April 2021 - 6
AOPA Pilot Magazine - April 2021 - 7
AOPA Pilot Magazine - April 2021 - 8
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AOPA Pilot Magazine - April 2021 - Cover3
AOPA Pilot Magazine - April 2021 - Cover4
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